Feat: ScrollScreenshot

[zbysir]

Add ScrollScreenshot, for https://github.com/go-rod/rod/issues/1008

[ysmood]

Good job! It will be great if you could add some tests.

[zbysir]

Good job! It will be great if you could add some tests.

Review again, please allow me to make some weird mistakes.

[zbysir]

Please fix the lint error in CI, you can check it on your local first go run ./lib/utils/lint.

The test doesn't work on Mac and Windows: https://github.com/go-rod/rod/actions/runs/7751056459/job/21138412821?pr=1010#step:4:25

Yes, I fixed it. Done.

[ysmood]

Please check the CI, if you need help let me know.

[zbysir]

@ysmood Need help:

The test code cannot cover the error branch below

              err = p.WaitStable(opt.WaitPreScroll)
                if err != nil {
                        return nil, fmt.Errorf("waitStable error: %w", err)
                }

I don't know how to fix it, I tried the test code below but it doesn't work

    g.Panic(func() {
        // mock error for WaitStable
        g.mc.stubErr(1, proto.DOMSnapshotCaptureSnapshot{})
        p.MustScrollScreenshotPage()
    })

Do you have any plans? Or is it appropriate for me to use time.Sleep() directly?

[zbysir]

@ysmood Please run CI again and it will almost succeed.

[zbysir]

@ysmood Thank you for your patient help!